Lucene (Indexer and Search) Component

Available as of Camel 2.2

The lucene component is based on the Apache Lucene project. Apache Lucene is a powerful high-performance, full-featured text search engine library written entirely in Java. For more details about Lucene, please see the following links

The lucene component in camel facilitates integration and utilization of Lucene endpoints in enterprise integration patterns and scenarios. The lucene component does the following

builds a searchable index of documents when payloads are sent to the Lucene Endpoint

facilitates performing of indexed searches in Camel

This component only supports producer endpoints.

Maven users will need to add the following dependency to their pom.xml for this component:

URI format

You can append query options to the URI in the following format, ?option=value&option=value&...

Insert Options

Name

Default Value

Description

analyzer

StandardAnalyzer

An Analyzer builds TokenStreams, which analyze text. It thus represents a policy for extracting index terms from text. The value for analyzer can be any class that extends the abstract class org.apache.lucene.analysis.Analyzer. Lucene also offers a rich set of analyzers out of the box

indexDir

./indexDirectory

A file system directory in which index files are created upon analysis of the document by the specified analyzer

srcDir

null

An optional directory containing files to be used to be analyzed and added to the index at producer startup.

Query Options

Name

Default Value

Description

analyzer

StandardAnalyzer

An Analyzer builds TokenStreams, which analyze text. It thus represents a policy for extracting index terms from text. The value for analyzer can be any class that extends the abstract class org.apache.lucene.analysis.Analyzer. Lucene also offers a rich set of analyzers out of the box

indexDir

./indexDirectory

A file system directory in which index files are created upon analysis of the document by the specified analyzer

maxHits

10

An integer value that limits the result set of the search operation

Sending/Receiving Messages to/from the cache

Message Headers

Header

Description

QUERY

The Lucene Query to performed on the index. The query may include wildcards and phrases

RETURN_LUCENE_DOCS

Camel 2.15: Set this header to true to include the actual Lucene documentation when returning hit information.

Lucene Producers

This component supports 2 producer endpoints.

insert - The insert producer builds a searchable index by analyzing the body in incoming exchanges and associating it with a token ("content").

query - The query producer performs searches on a pre-created index. The query uses the searchable index to perform score & relevance based searches. Queries are sent via the incoming exchange contains a header property name called 'QUERY'. The value of the header property 'QUERY' is a Lucene Query. For more details on how to create Lucene Queries check out http://lucene.apache.org/java/3_0_0/queryparsersyntax.html

Lucene Processor

There is a processor called LuceneQueryProcessor available to perform queries against lucene without the need to create a producer.

Lucene Usage Samples

Example 1: Creating a Lucene index

Example 2: Loading properties into the JNDI registry in the Camel Context